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Boiler
Model
Boiler
Supply
Connection,
Inch, FPT
Boiler
Return
Connection,
Inch, FPT
Near-
Boiler
Piping
Supply
Pipe
Size,
Inch
Near-
Boiler
Piping
Return
Pipe
Size,
Inch
Max
Allowable
Flow thru
Boiler,
GPM
@ 20°F
Delta T
Flow,
GPM
@ 25°F
Delta T
Min Req’d
Flow thru
Boiler,
GPM
@ 35°F
Delta T
Alliance SL
Models to
be installed
As Part of
Near-Boiler
Piping
Alliance SL
Coil
Required
Flow Rate,
GPM
Alliance SL
Coil Head
Loss, Ft @
Required
Flow Rate
Combined
Boiler,
Alliance SL
& Piping
Loop Head
Loss, Ft
*Recommended
Circulator Make &
Model for
Alliance SL
installed as Part of
Near-Boiler Piping
Reference
Figure
Notes
ALP080 1 1 1 1 7.3 5.8 4.2
SL27 6 9 19.3
Taco 0010 Grundfos
UPS26-99 FC
(second speed)
32A or
32B
SL35 6 9 19.3
SL50 6 9.5 19.8
SL70 6 10 20.3
SL119 14 17 NA Not Recommended NA Note 1
ALP105 1 1 1 1 9.6 7.7 5.5
SL27 6 9 19.3
Taco 0010 Grundfos
UPS26-99 FC
(second speed)
32A or
32B
SL35 6 9 19.3
SL50 6 9.5 19.8
SL70 6 10 20.3
SL119 14 17 NA Not Recommended NA Note 1
ALP150 1 1 1 1 13.8 11 7.9
SL27 6 9 NA Not Recommended
32C or 32D Note 2
SL35 6 9 NA Not Recommended
SL50 6 9.5 NA Not Recommended
SL70 6 10 NA Not Recommended
SL119 14 17 36
Taco 1400-45
Grundfos UPS 32-
80/2 (max speed)
32A or
32B
NOTES:
Note 1: Required Alliance SL Coil Flow Rate exceeds Max Allowable Flow Rate thru Boiler; this Boiler/Alliance SL combination may result in boiler heat exchanger
erosion and noise.
Note 2: Required Alliance SL Coil Flow Rate is below Min Required Flow Rate thru Boiler; this Model can only be installed as separate heating zone off system header
-seeFigures32Cand32DforalternateIWHpiping.IndirectWaterHeaterCirculatormustbeselectedbyaninstallerbasedonAllianceSLrequiredcoilow
and corresponding coil head loss shown as well as total equivalent length of such separate zone.
Note 3: Combined Head Loss shown corresponds to Min Required Flow Rate thru Boiler.
*CirculatorModelsshownarenotequippedwithinternalowcheckvalve(IFC).
When selecting Circulators with IFC contact Circulator Manufacturer for sizing information.
Near-Boiler Piping Size shown is based on 2 to 5.5 Ft/sec velocity range to avoid potential noise and pipe erosion.
Table 12B: Recommended Circulator Models for Alpine (ALP) Boilers and Alliance SL Indirect Water Heaters
Installed as Part of Near-Boiler Piping Up to 75 Ft. Equivalent Length - Indirect Water Heater Circulator